Vacuum cleaner



FIG. 1 is a front perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a front and side-perspective view of FIG. 1;

FIG. 3 is a rear and side-perspective view of FIG. 1;

FIG. 4 is a front and side-perspective view of a second embodiment thereof; and,

FIG. 5 is a rear and side-perspective view of FIG. 4.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 